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DaveBryan-5712 avatar image
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DaveBryan-5712 asked SamNdundaAP-9793 commented

Office365 migration-Cannot remove remote user mailbox message size restriction

We are migrating from Exchange 2010 to Office365. We migrated a mailbox that is now in the cloud, but we cannot send him a larger attachment because his remote mail user contact shows a 5GB limit. The setting is greyed-out and not seeing a way to change it. The O365 mailbox does not show that restriction, but does anyone have any ideas on how to remove a greyed-out message size restriction on a remote user mailbox?

office-exchange-server-administrationoffice-exchange-server-mailflowoffice-exchange-server-connectivity
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Hi @DaveBryan-5712
According to your description, this question seems to be related to Exchange, so we would move the irrelevant tags.

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Hi @DaveBryan-5712 ,

Do suggestions below help?

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Hi @DaveBryan-5712 , is there any update about your issue?

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AndyDavid avatar image
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AndyDavid answered SamNdundaAP-9793 commented

You can view with on-prem Exchange Powershell get-remotemailbox to confirm:

 Get-RemoteMailbox <user>  |FL *max*

If there is a value there, clear via adsiedit.msc

MaxReceiveSize in Exchange = delivContLength in AD

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MaxSendSize in Exchange = submissionContLength in AD


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Hi @DaveBryan-5712 , Did that work for you?

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This worked

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joyceshen-MSFT avatar image
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joyceshen-MSFT answered

Hi @DaveBryan-5712 ,

Agree with the suggestion from Andy, you could also use the command below to clear the values

 set-ADUser -Identity user -clear submissionContLength
 set-ADUser -Identity user -clear delivContLength

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5 |1600 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.